Not having been a warhammer player myself, I find the inspirations and connections interesting (was just talking about that in a couple of other threads as to whether new stuff was out of place or not, having been found in the same setting that inspired it) but am not one who insists the two have to merge, one at the expense of the other. Longevity and popularity are one thing, but the relatively small size of HQ compared to WH is kind of the whole point. Even the fact that we're getting 37 new official quests this year is a big deal for this franchise (whether they're accepted by that fanbase remains to be seen).
And for everyone who disagrees, there's always Warhammer Quest, if you can find a copy...